Golubac Fortress (Serbian: Голубачки град or Golubački grad, Hungarian: Galambóc vára) was a medieval fortified town on the right side of the Danube River, 4 kilometers downstream from the modern-day town of Golubac, Serbia. Golubac, in the Braničevo District of north-eastern Serbia and on the modern-day border with Romania, marks the entrance to the Đerdap national park. It is strategically located on the embankment of the Danube River where it narrows to form the Iron Gate gorge, allowing for the regulation and taxation of traffic across and along the river.